(i)[2]
Show that angle $DOE$ has a value of $1.287$ radians, correct to $4$ significant figures.
(ii)[3]
Find the total perimeter of the metal plate.
(iii)[3]
Find the total area of the metal plate.
Mathematics 9709 · AS & A Level · Circular measure
Circular measure — practice question
The diagram illustrates a metal plate $ABCDEF$ formed by removing the two shaded regions from a circle of radius $10$ cm and centre $O$. The parallel sides $AB$ and $ED$ each have length $12$ cm.